Silicon Audio Short Period Seismometer
The Silicon Audio short-period Omnitilt seismometer is an optical seismic sensor that stays tilt-insensitive through 360 degrees, suited to both permanent stations and rapid portable deployments.
- Passband
- 0.1-150 Hz
- Clip level
- ±40 mm/s
- Dynamic range
- 135 dB
Overview
In detail
How it works
The sensor uses a force-balance mass with an interferometric (optical) transducer to achieve low self-noise and a high clip level, with automatic mass centring and no mass lock required. This lets it remain fully tilt-insensitive and omnidirectional across a full 180° range.
Measurement
It offers a flat passband from 0.1 to 150 Hz, a clip level of ±40mm/s, and 135dB of dynamic range, with self-noise below the low-noise model from 0.1-1Hz and close to it above 1Hz.
Deployment
The sensor withstands shocks above 3000g and is available in vault or porthole packaging, in a small, lightweight and rugged 3-axis configuration suited to permanent observation or portable stations.
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Specifications
Technical specifications
- Passband
- 0.1-150 Hz
- Clip level
- ±40 mm/s
- Dynamic range
- 135 dB
- Sensitivity
- 885 V/m/s
- Tilt tolerance
- ±180°
- Shock tolerance
- >3000g
- Dimensions
- Posthole: 83mm dia x 120mm H; Vault: 115 x 115 x 68mm
- Configuration
- 3-axis
- Sensing method
- Force balance with interferometric transducer
Related
Often specified alongside
ESS Earth
Strong Motion Accelerograph
- Range
- ±4g accelerometer range
- Storage
- Local SD card, continuous ring buffer
- Connectivity
- Ethernet or cellular modem telemetry (optional)
- Range
- ±2g, ±5g, ±10g and higher, up to ±400g full scale
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